Undertow is the debut studio album by the American rock band Tool, released on April 6, 1993, by Zoo Entertainment. Produced by the band and Sylvia Massy, it was recorded from October to December 1992 at Sound City Studios in Van Nuys and Grandmaster Recorders in Hollywood. The album includes some tracks the band decided to not release on their debut EP Opiate. This is their only album to feature original bassist Paul D'Amour.

Tool is an American rock band from Los Angeles. Formed in 1990, the group consists of vocalist Maynard James Keenan, guitarist Adam Jones, drummer Danny Carey and bassist Justin Chancellor, the latter of whom replaced founding member Paul D'Amour in 1995. Tool has won four Grammy Awards, performed worldwide tours, and produced albums topping the charts in several countries.